Q: Blower motor whine

asked by on

Hello. I've just replaced the blower motor (fan motor) and when I turn the air on there is a whine/hum which increases in pitch when I turn the fan setting up. Is it normal for the fan motor to rub against the blower motor housing? I noticed when I turn the fan blades manually, there is resistance against the housing. If so how cold I fix it? The part is proper size. Perhaps theres sone thing in the way or perhaps it was reassembled improperly enough to cause this. If it's normal then I'm not sure what it could be. The resistor is fine but if it isn't, is here a way to check if it's damaged or not? It looks fine. Thank you

My car has 216000 miles.
My car has a manual transmission.

Hello, thank you for writing in. If it is an aftermarket blower motor, as opposed to an OEM original dealer part, that might account for the noise. That would be my first suspicion, especially if you are sure you have otherwise installed it correctly. Aftermarket parts can often be very problematic and in many cases are dramatically different (inferior) compared to the OEM part. One way to test for a defect is to operate the fan outside of the car in free air and evaluate the noise level. If the fan is clearly noisy as well, the part is simply no good. If it is an OEM part but noisy, you might have a defective unit or you might not have installed it properly. Depending on what your circumstances are (i.e., if you end up obtaining a replacement motor) feel free to inquire further; YourMechanic is mobile and can assist you with the installation by coming to your home or office.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Blower motor whine

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Upper radiator hose keeps building up a lot of pressure and popping off. Car loses coolant and over heats.

Hello, thank you for writing in. The radiator hoses can pop off for several reasons. Typically it is because the hose or the plastic neck that connects it to the radiator/component has failed. You will want to inspect both sides...

Q: Q: Alternator not charging battery

Hi there. To be honest, when the alternator tests as good and the battery terminals are good, this issue is typically very difficult to diagnose. In most cases however, this is either an electrical relay fault to the charging system...

Q: My fan for my a c and heater is only blowing air on 2 3 and 4 settings but not 1

The blower motor resistor, in the motor speed control circuit, is probably faulty. If your vehicle does not have automatic temperature control, the part that needs to be replaced is relatively inexpensive. If you desire a definitive diagnosis, and replacement...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...